Question

12. A convex lens of focal length 30 cm produces a real image 3 times magnified. Find the object distance.​

Answer 1

Answer:

Given:f = 20 cm

m = -3 = v/u

v = -3u

Lens formula: 1/v - 1/u = 1/f

                        1/(-3u) - 1/u = 1/20

       - 4/(3u) = 1/20

           3u = - 4 x 20

              u = -80/3 = - 26.6 cm

The object is at a distance of 26.6 cm to the left from the optic centre of the lens.

Explanation:

Answer 2

Answer:

hope my attachment answer is correct